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Dark activated switch

August 16, 2011 by

Dark Activated Switch by IC 741 This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an external light or buzzer.The light sensor used is the ORP12 photocell. In bright light the resistance of the ORP12 can be as low as 80 ohm and at 50lux (darkness) the resistance increases to over 1 Mohm. The 1M control should provide a wide range for light intensities,
Dark Activated Switch
Dark Activated Terrace Lamp. Friday, February 11th, 2011. Compact circuit, Can be wired in parallel to existing switches This device allows one or more 
12V 10A Dark Activated Switch by LM324
The circuit is a combination manual switch and automatic dark-activated switch. It is designed to control up to 10 amps of 12V lights. A pair of high-intensity white LEDs are included in the circuit for built-in lighting. The circuit includes a low voltage disconnect circuit that prevents
Dark Activated Terrace Lamp
Compact circuit, Can be wired in parallel to existing switches
This device allows one or more lamps to illuminate at sunset and turn off at dawn.Q1 and Q2 form a trigger device for the SCR, providing short pulses at 100Hz frequency. Pulse duration is set by R2 and C1.When the light hits R1, the photo resistor assumes a very low resistance value, almost shorting C1 and preventing circuit operation.
Simple Light Actuated Relay by Phototransistor
The Sun – Up Relay Switch can be used to provide a audible switch for when the sun comes up. It can also be used to detect a light beam, headlights etc. This circuit is easy because it used one Transistor 2N2222-2SC945-2SC828-BC549 etc , Relay and Photo transistor Only. The important part of the circuit is very low cost. (I like it) …
Light Activated Switch
Dark Activated Switch by IC 741. Tuesday, May 29th, 2007. This circuit will activate a relaywhen light falls to a preset level. Light level can be adjusted 
Light Relay Switch
Oct 5, 2007  The low voltage disconnect has a load on-off switch BC337 Related Links More circuit about Light Switch Dark Activated switch by IC 741 
Light Dark Detector Alarm by IC 555
Today we come to see the circuit detects the light by have a voice warn. When meet the light or be become dark depend on using S1 ( follow the circuit ). For this my circuit uses the integrated circuit IC 555 be pillar equipment again. You can choose can use many the number be LM555 or NE555 or use the number instead of eat the low beam be IC 7555 all right. For that circuit when S1 stay in a position …..
Dark Activated Led or Lamp Flasher
This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about 1Hz and is set by C1 value. The LED starts flashing when the photo resistor is scarcely illuminated. The onset of flashing can be set by trimming R2.

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Automatic light switch

August 16, 2011 by

Automatic Lamp Control with Light Sensitive Switch
The circuit above is an automatic switch which functions in absence of light. The IC 4060 works as an oscillator and the generated signal is applied to the base of T4 transistor. Phototransistor T3 is in conduction by existance of light and it keeps the T5 transistor’s base at ground potential.
Automatic Light Switch
May 4, 2011 This simple automatic emergency light has the following advantages over conventional emergency lights: 1. The charging circuit stops
Automatic Light Controller Using 7806
Voltage regulator ICs (78xx series) provide a steady output voltage, as against a widely fluctuating input supply, when the common terminal is grounded. Any voltage about zero volt (ground) connected in the common terminal is added to the output voltage. That means the increase in the common terminal voltage is reflected at the output.
Automatic Headlight Brightness Switch
Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam headlights when there is oncoming traffic. It does this by sensing the lights of that traffic.
Automatic Light Dimmer
In many cases, the dimmer presented here may be built into a wall-mounted box containing the light switch. It is intended for use with 240 V incandescent lamps only. When it is fitted, and the light is switched on, the lamp does not come on fully for about 400 ms (which is not noticeable).
Fully Automatic Emergency Light
This simple automatic emergency light has the following advantages over conventional emergency lights:1. The charging circuit stops automatically when the battery is fully charged. So you can leave the emergency light connected to AC mains overnight without any fear.
Dark Activated Switch by IC 741
This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an external light or buzzer.Notes:
The light sensor used is the ORP12 photocell. In bright light the resistance of the ORP12 can be as low as 80 ohm and at 50lux (darkness) the resistance increases to over 1 Mohm.
Vehicle Interior Lighting With Switch-Off Delay
Nowadays, a switch-off delay for the vehicle interior lighting is a naturally a standard feature. However, with certain models having only spartan ?ttings, or older-model vehicles, you’re left sitting in the dark as soon as you climb in and close the door. That calls for an aftermarket accessory! The author built this circuit using ‘normal’ components (with leads), but in the SMD manner,

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Solar Outdoor Lights

August 15, 2011 by

Solar Outdoor Lights
Jul 1, 2008  Read more original source: http://members.shaw.ca/novotill/SolarGardenLight/ index.htm Related Links More circuit about solar outdoor lights

Solar Garden Lamp
Feb 14, 2011  Read more original source: http://members.shaw.ca/novotill/SolarGardenLight/ index.htm Related Links More circuit about solar outdoor lights

Solar garden LED light and single NiCd AA charger
Another Reverse engineered circuit diagram of a mass produced solar LED light. This light also automatically turns on when there is no light falling upon the solar cell but this circuit waits untill it gets bit darker outside than the one above. Although battery charging is through a schottky diode,

Solar garden lamp by CDS photocell control
Reverse engineered circuit diagram of yet another commercially produced solar garden lamp. This one depends upon a CDS photocell to turn the light on at night, and although more complex than the circuits, it allows the battery to charge more efficiently.

CDS Photocell Control
Jul 1, 2008  Read more original source: http://members.shaw.ca/novotill/SolarGardenLight/ index.htm Related Links More circuit about solar outdoor lights

Solar Cell
Feb 16, 2008  The reading lamp consists of a small solar panel, a standard UPS style Solar lights outdoor garden The Posted in Power supply | 

10 Amp Solar Charge Controller by LM324
The circuit is a solar charge controller, it’s function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic overcharging, and automatic temperature compensation for better charging over a range of temperatures.

Solar Cell charges a NiCd AA cell when darkness falls
Jun 28, 2008  Reverse engineered circuit diagram of a popular mass produced solar light. The light automatically turns on when there is no light falling upon the solar cell, so the parts count is minimal. The charging circiut is not particularly efficient since the battery must charge through a plain diode.

Solar Cell Charger
Feb 15, 2008  The reading lamp consists of a small solar panel, a standard UPS style Solar lights outdoor garden The Posted in Power supply | 

Solar Powered Reading Lamp by LM2941
Feb 15, 2008  The reading lamp consists of a small solar panel, a standard UPS style lead acid battery, and an LED circuit board. The circuit board contains a low power solar charge controller (regulator), a set of 8 white LEDs, a switch, an LED current regulator, and a low voltage disconnect circuit.

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Headlight Flasher

August 9, 2011 by

This circuit was requested from an email. It will allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. The circuit is based on the 555 timer or LM7555 timer. …Read more

Other circuits : 555 led flasher circuit :: Auto lighting circuit :: Headlight flasher circuit

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Color Organ

August 9, 2011 by

I have had many requests for this circuit. It was a very popular unit years ago. The basic idea of the project is to make different colored bulbs light at different frequencies of music… Read more

Other circuits Organ color circuits :: Lamp flasher :: Sound Light :: Light music circuit

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